Poisson kernel of half spaces in real hyperbolic spaces

Abstract : We provide an integral formula for the Poisson kernel of half-spaces for Brownian motion in real hyperbolic space $\H^n$. This enables us to find asymptotic properties of the kernel. We also show convergence to the Poisson kernel of the whole space $\H^n$. For n=3, 4 or 6 we compute explicit formulas for the Poisson kernel itself.